Mendel's Law of Inheritance

Q.

In the Mendelian dihybrid cross, out of 256 individuals obtained in the F2 generation, how many are pure homozygous for both traits?

1. 32

2. 16

3. 8

4. 48

Q. The phenotypic ratio obtained in the ${\text{F}}_2$ generation for a dihybrid cross between round yellow seeds and green wrinkled seeds is:

1. 9:3:3:3
2. 9:3:3:1
3. 9:5:3:1
4. 9:3:4:3

Q.

In the Mendelian dihybrid cross, out of 240 individuals obtained in the F2 generation, how many of the offsprings would be pure homozygous?

1. 30

2. 15

3. 8

4. 45

Q. What is the genotype of ${F_1}^{}$ generation produced by Mendels homozygous dihybrid cross between yellow round and green wrinkled seeds?

1. YyRr
2. Yyrr
3. YyRR
4. yyRR

Q.

The phenotypic ratio for Mendel’s dihybrid cross is

1. 3:1

2. 9:3:3:1

3. 1:1

4. 1:2:1

Q. The gametes produced in the ${\text{F}}_1$ generation of Mendel’s dihybrid cross between a pea plant with round green seeds and wrinkled yellow seeds are _____.

1. Yr & yR
2. Y, y, R, r
3. Yy & Rr
4. YR & yr

Q.

The cross between $F_1$ individual with any one of the parents is called ___.

1. Back cross

2. Test cross

3. Reciprocal cross

4. Top cross

Q. What percent of seeds in F₂ generation of Mendelian dihybrid cross had recessive phenotypes regarding seed colour and seed shape?

मेण्डलीयन द्विसंकर संकरण की F₂ पीढ़ी में कितने प्रतिशत बीजो में बीज रंग तथा बीज आकार के संदर्भ में अप्रभावी लक्षणप्ररूप (फीनोटाइप) होते हैं?

1. 43.75%
2. 37.5%
3. 6.25%
4. 56.25%

Q. How did Mendel explain that it is possible that a trait is inherited but not expressed in an organism?

Q. In Mendels experiments, ______ traits started to appear from $F_2$ generation.

1. recessive
2. phenotypic
3. dominant
4. heterozygous

Q. The number of phenotype recombinant offsprings formed during $F_2$ generation of a dihybrid cross are

1. $9/16$
2. $6/16$
3. $7/16$
4. $4/16$

Q. Double homozygous individuals in $F_2$ generation of a dihybrid cross would be

1. 2/16
2. 6/16
3. 1/16
4. 9/16

Q. Transfer of pollen from the anther to the stigma of the same flower or another flower on the same plant is called .

1. Cross pollination
2. Self pollination
3. Wilting
4. Hybridization

Q. What is law of independent assortment?

Q. Define dominant and recessive traits.

Q.

A cross is made between true breeding lines of pea plants with axillary and terminal flowers. If 1240 progeny are obtained, what is the ratio between homozygous plants and heterozygous plants of $F_2$ progeny?

1. 3:1

2. 1:2:1

3. 1:1

4. 1:1:2

Q. Organisms phenotypically similar but genotypically different are said to be

1. Heterozygous
2. Monozygous
3. Homozygous
4. Multizygous

Q.

The cross between $F_1$ individual with any one of the parents is called ___.

1. Back cross

2. Test cross

3. Reciprocal cross

4. Top cross

Q.

Question 45
In question 44, what are the combinations of character in the F2 progeny? What are their ratios?

Q. F1 generation means:

1. First filial generation
2. First seed generation
3. First flowering generation
4. First fertile generation

Q. Match the following pea phenotypes to their respective genotypes.

1. Tt
2. TT
3. tt

Q.

Recessive character appears in $25\%$ of the ${\text{F}}_2$ progeny in Mendel’s monohybrid cross.

1. False

2. True

Q. In a pair of contrasting traits, the trait that gets expressed in the progeny is called as ______ trait.

1. dominant
2. recessive
3. phenotypic
4. genotypic

Q.

The genotype of $F_1$ hybrid produced by crossing pure yellow round seeded plant with green wrinkled seeded plant is

1. Double heterozygous

2. Double homozygous

3. Homozygous for one character and heterozygous for the other

4. Homozygous for both characters

Q. The punnett square shown below represents the pattern of inheritance in a dihybrid cross when yellow seed colour (Y) is dominant over white (y) and round shape (R) is dominant over wrinkled (r) seeds:

A plant of type 'H' will produce seeds with genotypes identical to the seeds produced by the plants of:

1. Type M
2. Type U
3. Type S
4. Type N

Q. Which of the following is a dominant trait?

1. Haemophilia
2. Albinism
3. Colour blindness
4. Rh factor

Q. A cross involving parents differing only in one trait is:

1. Diploid
2. Monohybrid cross
3. Haploid
4. Dihybrid cross

Q. Genotype means

1. Genetic composition of the individual
2. Genetic composition of the germ cell
3. Genetic composition of plastids
4. Genetic composition of an organ

Q. Based on the observations of the monohybrid cross, Mendel postulated the law of which distinguished dominant and recessive characters.

1. dominance
2. recessiveness
3. segregation
4. assortment

Q. Recessive characters are expressed in both homozygous and heterozygous state.

1. False

2. True